71306245 has 8 divisors (see below), whose sum is σ = 90600984. Its totient is φ = 53689344.

The previous prime is 71306219. The next prime is 71306267. The reversal of 71306245 is 54260317.

It can be written as a sum of positive squares in 4 ways, for example, as 2896804 + 68409441 = 1702^2 + 8271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71306245 - 2⁷ = 71306117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419364 + ... + 419533.

It is an arithmetic number, because the mean of its divisors is an integer number (11325123).

Almost surely, 2^71306245 is an apocalyptic number.

It is an amenable number.

71306245 is a deficient number, since it is larger than the sum of its proper divisors (19294739).

71306245 is a wasteful number, since it uses less digits than its factorization.

71306245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838919.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 71306245 is about 8444.3025170822. The cubic root of 71306245 is about 414.6762753391.

The spelling of 71306245 in words is "seventy-one million, three hundred six thousand, two hundred forty-five".